B1697
Mirror Driver/Passenger Switch Circuit Short To Battery
Body Chassis/Safety Mirror Control Circuit 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The mirror control switch is sending a constant high voltage signal to the ECU instead of variable signals, like a light switch stuck in the 'on' position. This prevents the mirror motors from responding to driver input.

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Symptoms You May Notice
3 known symptoms for this code
Driver or passenger side mirror does not adjust in any direction
Mirror control switch unresponsive or non-functional
Fault code displayed on dashboard
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage signal from the mirror switch circuit, expecting variable voltage levels (0-5V) that correlate to switch positions. A short to battery keeps voltage at maximum (12V) continuously, preventing the ECU from detecting switch movement.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Mirror Switch Voltage 0-5V variable based on switch position Constant 12V (battery voltage)
Circuit Resistance Variable 0-10kΩ depending on position Near 0Ω (direct short to battery)
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Mirror switch connector
Inspect and reseat the connector at the driver/passenger door switch to eliminate poor contact causing false battery voltage reading.
2
Mirror switch assembly
Replace the faulty mirror control switch which is internally shorted to battery voltage.
3
Wiring harness section
Check and repair any damaged or pinched wiring between the switch and BCM that may be grounding to the battery positive line.